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    <title>Document</title>
    <script type="text/javascript">
        window.onload=function()
        {
            //手机类
            function Phone(brand,price){
                this.brand=brand;
                this.price=price;
            }
            Phone.prototype.call=function()
            {
                console.log("我可以打电话");
            };

            //智能手机
            function SmartPhone(brand,price,color,size){
                Phone.call(this,brand,price);
                this.color=color;
                this.size=size;
            }

            //设置子级构造函数的原型
            SmartPhone.prototype=new Phone;
            SmartPhone.prototype.constructor=SmartPhone;
            //声明子类的方法
            SmartPhone.prototype.phoyo=function()
            {
                console.log("我可以拍照");
            };
            SmartPhone.prototype.playGame=function()
            {
                console.log("我可以玩游戏");
            };
            const chuizi=new SmartPhone("锤子",2499,"黑色","5.5inch");
            console.log(chuizi);
        };
    </script>
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